Using Black Sand
I'd like to ask about black sand. Correct me if I'm wrong, but the black sand is not calcium-based, it's volcanic rock.
So is it a problem if you don't have the buffering capacity of the calcium sands?
Is it still useful for a DSB?
And is it sharp-edged instead of round-edged? i.e. is it a problem for digging critters or fish like a jawfish?
I really like the way it looks, but I won't use it if it's harmful........
thanks
|